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LOANS - Total Loans Outstanding (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 5,055,226	$ 4,919,997
Percentage of loans receivable	100.00%	100.00%
Less: Allowance for credit losses	$ (80,711)	$ (71,972)	$ (73,180)	$ (72,058)	$ (71,215)	$ (72,606)
Net deferred loan fees	(2,885)	(3,463)
Loans, net	4,971,630	4,844,562
Total commercial loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 4,487,424	$ 4,367,788
Percentage of loans receivable	88.80%	88.80%
Total consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 567,802	$ 552,209
Percentage of loans receivable	11.20%	11.20%
Other consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 97,895	$ 96,022
Percentage of loans receivable	1.90%	1.90%
Commercial and industrial loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 1,526,277	$ 1,420,764
Percentage of loans receivable	30.20%	28.90%
Commercial and industrial loans: | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: Allowance for credit losses	$ (39,161)	$ (30,338)	(30,720)	(30,978)	(31,190)	(35,290)
Commercial and industrial loans: | Working capital lines of credit loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 697,754	$ 604,893
Percentage of loans receivable	13.80%	12.30%
Commercial and industrial loans: | Non-working capital loans | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 828,523	$ 815,871
Percentage of loans receivable	16.40%	16.60%
Commercial real estate and multi-family residential loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 2,503,380	$ 2,437,534
Percentage of loans receivable	49.50%	49.50%
Commercial real estate and multi-family residential loans: | Construction and land development loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 658,345	$ 634,435
Percentage of loans receivable	13.00%	12.90%
Commercial real estate and multi-family residential loans: | Owner occupied loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 830,018	$ 825,464
Percentage of loans receivable	16.40%	16.80%
Commercial real estate and multi-family residential loans: | Nonowner occupied loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 762,365	$ 724,101
Percentage of loans receivable	15.10%	14.70%
Commercial real estate and multi-family residential loans: | Multifamily loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 252,652	$ 253,534
Percentage of loans receivable	5.00%	5.10%
Agri-business and agricultural loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 361,064	$ 388,764
Percentage of loans receivable	7.20%	7.90%
Agri-business and agricultural loans: | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less: Allowance for credit losses	$ (3,668)	$ (4,150)	$ (4,112)	$ (4,402)	$ (4,621)	$ (4,429)
Agri-business and agricultural loans: | Loans secured by farmland | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 161,410	$ 162,890
Percentage of loans receivable	3.20%	3.30%
Agri-business and agricultural loans: | Loans for agricultural production | Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 199,654	$ 225,874
Percentage of loans receivable	4.00%	4.60%
Other commercial loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 96,703	$ 120,726
Percentage of loans receivable	1.90%	2.50%
Consumer 1-4 family mortgage loans:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 469,907	$ 456,187
Percentage of loans receivable	9.30%	9.30%
Consumer 1-4 family mortgage loans: | Closed end first mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 259,094	$ 258,103
Percentage of loans receivable	5.10%	5.20%
Consumer 1-4 family mortgage loans: | Open end and junior lien loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 197,861	$ 189,663
Percentage of loans receivable	3.90%	3.90%
Consumer 1-4 family mortgage loans: | Residential construction and land development loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable before allowance for credit loss	$ 12,952	$ 8,421
Percentage of loans receivable	0.30%	0.20%

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